Do not apply config provider if not set

(cherry picked from commit 5d1dc3e)

Author: metacosm

core/deployment/src/main/java/io/quarkus/deployment/builditem/DevServicesResultBuildItem.java

@@ -178,8 +178,10 @@ public Map<String, String> getConfig(Startable startable) {
         if (config != null && !config.isEmpty()) {
             map.putAll(config);
         }
-        for (Map.Entry<String, Function<Startable, String>> entry : applicationConfigProvider.entrySet()) {
-            map.put(entry.getKey(), () -> entry.getValue().apply(startable));
+        if (applicationConfigProvider != null) {
+            for (Map.Entry<String, Function<Startable, String>> entry : applicationConfigProvider.entrySet()) {
+                map.put(entry.getKey(), () -> entry.getValue().apply(startable));
+            }
         }
         return map;
     }
@@ -263,6 +265,7 @@ public OwnedServiceBuilder<T> serviceConfig(Object serviceConfig) {
             return this;
         }
 
+        @SuppressWarnings("unchecked")
         public <S extends Startable> OwnedServiceBuilder<S> startable(Supplier<S> startableSupplier) {
             this.startableSupplier = startableSupplier;
             return (OwnedServiceBuilder<S>) this;
@@ -273,11 +276,13 @@ public OwnedServiceBuilder<T> postStartHook(Consumer<T> postStartAction) {
             return this;
         }
 
+        @SuppressWarnings({ "unchecked", "rawtypes" })
         public OwnedServiceBuilder<T> configProvider(Map<String, Function<T, String>> applicationConfigProvider) {
             this.applicationConfigProvider = (Map<String, Function<Startable, String>>) (Map) applicationConfigProvider;
             return this;
         }
 
+        @SuppressWarnings("unchecked")
         public DevServicesResultBuildItem build() {
             return new DevServicesResultBuildItem(name, description, serviceName, serviceConfig, config,
                     (Supplier<Startable>) startableSupplier,